EP0366347B1 - Improvements in mechanical pumps - Google Patents
Improvements in mechanical pumps Download PDFInfo
- Publication number
- EP0366347B1 EP0366347B1 EP89310702A EP89310702A EP0366347B1 EP 0366347 B1 EP0366347 B1 EP 0366347B1 EP 89310702 A EP89310702 A EP 89310702A EP 89310702 A EP89310702 A EP 89310702A EP 0366347 B1 EP0366347 B1 EP 0366347B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotor
- cavity
- rotors
- outlet
- pump
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C18/123—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with radially or approximately radially from the rotor body extending tooth-like elements, co-operating with recesses in the other rotor, e.g. one tooth
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C18/082—Details specially related to intermeshing engagement type pumps
- F04C18/088—Elements in the toothed wheels or the carter for relieving the pressure of fluid imprisoned in the zones of engagement
Definitions
- the present invention relates to mechanical pumps and in particular to mechanical vacuum pumps incorporating at least one pair of intermeshing rotors, especially rotors of the type known as "claw" rotors.
- FIG. 1a to 1d of the accompanying drawings shows a pair of rotors 5,8 mounted on respective shafts 1A,1B for rotation about the shafts in the direction shown by the arrows with the claws 7,13 closely engaging the walls of a chamber 2.
- the claws scoop the liquid as they rotate, and the claw 7 of the rotor 8 which is associated with the inlet port 9 throws the liquid towards the outlet port 3 as it rotates from the positions 1a through 1b to 1c of Figure 1.
- the present invention is concerned with the provision a mechanical pump having at least one pair of intermeshing rotors in which any hydraulic hammering effect can be mitigated or prevented by providing a cavity in a leading edge of a rotor to retain the liquid during critical parts of the pump cycle.
- a mechanical pump comprising first and second intermeshing rotors (5, 8), each rotor being mounted for rotation on respective shafts (1A, 1B) and located in a pumping chamber (2), an inlet (9) to the pumping chamber with which the first rotor is associated and an outlet (3) from the pumping chamber with which the second rotor (5) is associated, a cavity (6) being present in the surface of the second rotor (5) adjacent the outlet (3) which cavity (6) communicates with the outlet during each revolution of the second rotor, and the cavity being substantially cup-shaped, characterised in that the cavity extends in a radial direction and is positioned such that, in use of the pump, liquid present in the chamber is urged into, and retained within, the cavity during rotation of the second rotor and is ejected therefrom by centrifugal forces during communication between the cavity and outlet.
- the invention is primarily, but not exclusively, concerned with pumps having a "claw" type rotor profile.
- the nature of the cavity must be such that any condensed liquid which is present in particular in the volume of gas or vapour being "swept" by the rotors is urged into the cavity and ejected therefrom when the swept volume communicates with the chamber outlet.
- the pump is one in which the inlet to the pumping chamber is formed as a port in a first wall of the pumping chamber and the outlet from the pumping chamber is formed as a port in an opposite wall of the pumping chamber.
- the cavity is positioned in a side of the second rotor which engages the wall of the chamber containing the outlet.
- the position of the cavity is such that the condensed liquid is urged into the cavity by centrifugal force.
- the shape of the cavity is not important but preferably the shape is such that condensed liquid is retained within the cavity despite the rotation of the rotor and the centrifugal forces caused thereby. This can be achieved, for example, by arranging for the cavity to be substantially cup-shaped and extending in a direction such that centrifugally driven liquid is urged to the base of the cup before being deposited in the chamber outlet.
- the pump may comprise a plurality of individual chambers each having its own pair of rotors, some or, preferably, all of which may have cavities in accordance with the invention.
- the shafts on which the rotors are mounted it is generally preferable for the shafts on which the rotors are mounted to be orientated vertically. It is also preferable for the inlet to be positioned in a wall in the top of the chamber and for the outlet to be positioned in a wall at the bottom of the chamber.
- the pumping chamber 10 of a mechanical pump contains intermeshing claw type rotors 5, 8 each mounted on a shaft (not shown) in a manner known per se .
- the rotor 5 rotates in a clockwise sense as indicated by the arrows whilst rotor 8 rotates in an anti-clockwise sense.
- said liquid When used to pump a vapour which during the pumping operation condenses to a liquid, said liquid will be trapped in the space 12 between the rotors 5, 8at a time when the outlet port 3 is closed. As a consequence, the liquid can create a hammering effect between the rotors 5, 8 which can lead to mechanical failure.
- the rotor 5 which is associated with the outlet port 3 is formed with a cavity 6 on its surface immediately adjacent the side wall 4 in which the outlet port 3 is formed.
- the shape and location of the cavity 6 and its relation to the outlet port 3 is illustrated in Figures 2a to 2e and Figure 3.
- a cavity 6 is provided in the rotor face associated with the outlet port at each stage. In all cases, the position of the cavity is such that it does not interfere with the basic operation of the pump.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
- Rotary Pumps (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Description
- The present invention relates to mechanical pumps and in particular to mechanical vacuum pumps incorporating at least one pair of intermeshing rotors, especially rotors of the type known as "claw" rotors.
- When intermeshing claw type rotors are employed in mechanical vacuum pumps or compressors for use with gases or vapours which tend to condense or liquefy during the pumping or compression process, a hydraulic hammering effect is sometimes experienced. This hydraulic hammering effect is caused by the inability of the claw type rotors to expel liquid sufficiently rapidly from their swept volume. The liquid thus accumulates to give the hammering effect which can lead to mechanical failure.
- A typical claw type rotor mechanism is illustrated in Figures 1a to 1d of the accompanying drawings which shows a pair of
rotors claws 7,13 closely engaging the walls of achamber 2. - Any liquid formed in the volume swept by the
rotors inlet port 9 in the wall of thepumping chamber 10, tends to move radially outwards under centrifugal force towards thestator walls 2 away from theoutlet port 3 which is located in theside wall 4 adjacent the centre of therotor 5. The claws scoop the liquid as they rotate, and the claw 7 of therotor 8 which is associated with theinlet port 9 throws the liquid towards theoutlet port 3 as it rotates from the positions 1a through 1b to 1c of Figure 1. - However, in the critical position between
positions 1b and 1c, theoutlet port 3 is closed and this prevents expulsion of the liquid from thepumping chamber 10. The liquid is thereby trapped between therotors - The present invention is concerned with the provision a mechanical pump having at least one pair of intermeshing rotors in which any hydraulic hammering effect can be mitigated or prevented by providing a cavity in a leading edge of a rotor to retain the liquid during critical parts of the pump cycle. Although certain notches on the surface of rotors in pumps of this type have previously been divided - see US Patent Specification No. 3 472 445 and French Patent Application Publication No. 2 109 798 - none have had the ability to retain the liquid therein and have been used for different reasons.
- In accordance with the present invention, there is provided a mechanical pump comprising first and second intermeshing rotors (5, 8), each rotor being mounted for rotation on respective shafts (1A, 1B) and located in a pumping chamber (2), an inlet (9) to the pumping chamber with which the first rotor is associated and an outlet (3) from the pumping chamber with which the second rotor (5) is associated, a cavity (6) being present in the surface of the second rotor (5) adjacent the outlet (3) which cavity (6) communicates with the outlet during each revolution of the second rotor, and the cavity being substantially cup-shaped, characterised in that the cavity extends in a radial direction and is positioned such that, in use of the pump, liquid present in the chamber is urged into, and retained within, the cavity during rotation of the second rotor and is ejected therefrom by centrifugal forces during communication between the cavity and outlet.
- The invention is primarily, but not exclusively, concerned with pumps having a "claw" type rotor profile. The nature of the cavity must be such that any condensed liquid which is present in particular in the volume of gas or vapour being "swept" by the rotors is urged into the cavity and ejected therefrom when the swept volume communicates with the chamber outlet.
- Ideally, the pump is one in which the inlet to the pumping chamber is formed as a port in a first wall of the pumping chamber and the outlet from the pumping chamber is formed as a port in an opposite wall of the pumping chamber.
- Preferably the cavity is positioned in a side of the second rotor which engages the wall of the chamber containing the outlet. Most preferably the position of the cavity is such that the condensed liquid is urged into the cavity by centrifugal force. In general the shape of the cavity is not important but preferably the shape is such that condensed liquid is retained within the cavity despite the rotation of the rotor and the centrifugal forces caused thereby. This can be achieved, for example, by arranging for the cavity to be substantially cup-shaped and extending in a direction such that centrifugally driven liquid is urged to the base of the cup before being deposited in the chamber outlet.
- For the avoidance of any doubt, the pump may comprise a plurality of individual chambers each having its own pair of rotors, some or, preferably, all of which may have cavities in accordance with the invention.
- In practice, it is generally preferable for the shafts on which the rotors are mounted to be orientated vertically. It is also preferable for the inlet to be positioned in a wall in the top of the chamber and for the outlet to be positioned in a wall at the bottom of the chamber.
- For a better understanding of the invention, reference will now be made, by way of example only, to the accompanying schematic drawings in which:-
- Figures 1a to 1d are transverse cross-sectional sketches through a pumping chamber of a known mechanical pump employing intermeshing claw type rotors and illustrating different relative positions of the rotors during a pumping operation;
- Figures 2a to 2e are transverse cross-sectional sketches through a pumping chamber of a mechanical pump employing intermesjing claw type rotors embodying the present invention and which illustrate different relative positions of the rotors during a pumping operation; and
- Figure 3 is a perspective view of the rotors illustrated in Figure 2a.
- Figure 4 is a top view of two separate rotors for use in pumps of the invention showing differently shaped cavities therein.
- As shown in Figures 1a to 1d, the
pumping chamber 10 of a mechanical pump contains intermeshingclaw type rotors rotor 5 rotates in a clockwise sense as indicated by the arrows whilstrotor 8 rotates in an anti-clockwise sense. When used to pump a vapour which during the pumping operation condenses to a liquid, said liquid will be trapped in thespace 12 between therotors 5, 8at a time when theoutlet port 3 is closed. As a consequence, the liquid can create a hammering effect between therotors - Referring now to Figures 2a to 2e and Figure 3, the arrangement of the
pumping chamber 10 and therotors - The
rotor 5 which is associated with theoutlet port 3 is formed with acavity 6 on its surface immediately adjacent theside wall 4 in which theoutlet port 3 is formed. The shape and location of thecavity 6 and its relation to theoutlet port 3 is illustrated in Figures 2a to 2e and Figure 3. - When the shafts on which the
rotors bottom sidewall 4 in which theoutlet port 3 is located. This liquid is thrown into thecavity 6 in position 2b to 2c, in particular by the action of claw 7 ofrotor 8, and under centrifugal force is discharged into theoutlet port 3 as it passes over it in the position 2e back to 2a. Thecavity 6 expels a quantity of liquid, each revolution, sufficient to prevent build-up of liquid in the pumping chamber to such an extent that a hydraulic lock and resulting hammering could occur in position 2b to 2c betweenrotors Cavity 6 also forms part of the outlet passage through which pumped gases, vapours and the liquid are discharged. - It will be appreciated that in a multi-stage claw type rotor pump which in its normal operative position has the axes of the rotors vertical, a
cavity 6 is provided in the rotor face associated with the outlet port at each stage. In all cases, the position of the cavity is such that it does not interfere with the basic operation of the pump. - Finally, with reference to Figure 4, there is shown two different shapes which can usefully be employed in pumps of the invention.
Claims (4)
- A mechanical pump comprising first and second intermeshing rotors (5, 8), each rotor being mounted for rotation on respective shafts (1A, 1B) and located in a pumping chamber (2), an inlet (9) to the pumping chamber with which the first rotor is associated and an outlet (3) from the pumping chamber with which the second rotor (5) is associated, a cavity (6) being present in the surface of the second rotor (5) adjacent the outlet (3) which cavity (6) communicates with the outlet during each revolution of the second rotor, and the cavity being substantially cup-shaped, characterised in that the cavity extends in a radial direction and is positioned such that, in use of the pump, liquid present in the chamber is urged into, and retained within, the cavity during rotation of the second rotor and is ejected therefrom by centrifugal forces during communication between the cavity and outlet.
- A pump according to Claim 1 in which each rotor is of the "claw" type.
- A pump according to Claim 1 or Claim 2 in which the shaft in which the rotors are mounted are orientated substantially vertically.
- A pump according to any preceding claim in which the pump comprises a plurality (two or more) of individual pumping chambers having their own pair of rotors and each second rotor of which has a cavity.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB888825284A GB8825284D0 (en) | 1988-10-28 | 1988-10-28 | Improvements in mechanical pumps |
GB8825284 | 1988-10-28 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0366347A2 EP0366347A2 (en) | 1990-05-02 |
EP0366347A3 EP0366347A3 (en) | 1990-08-16 |
EP0366347B1 true EP0366347B1 (en) | 1993-07-07 |
Family
ID=10645948
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89310702A Expired - Lifetime EP0366347B1 (en) | 1988-10-28 | 1989-10-18 | Improvements in mechanical pumps |
Country Status (6)
Country | Link |
---|---|
US (1) | US5055017A (en) |
EP (1) | EP0366347B1 (en) |
JP (1) | JP3029202B2 (en) |
DE (1) | DE68907465T2 (en) |
ES (1) | ES2042004T3 (en) |
GB (1) | GB8825284D0 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4233142A1 (en) * | 1992-10-02 | 1994-04-07 | Leybold Ag | Method for operating a claw vacuum pump and claw vacuum pump suitable for carrying out this operating method |
DE19629174A1 (en) * | 1996-07-19 | 1998-01-22 | Leybold Vakuum Gmbh | Claw pump for producing vacuum |
GB2426036A (en) * | 2005-05-10 | 2006-11-15 | Bernard Whicher | Vertical Northey compressor |
RU2282063C1 (en) * | 2005-09-01 | 2006-08-20 | Виктор Павлович Шлапацкий | Rotary machine |
US20070172790A1 (en) * | 2006-01-26 | 2007-07-26 | Midmark Corporation | Dental Vacuum System |
CN104929942B (en) * | 2015-07-09 | 2016-10-05 | 中国石油大学(华东) | A kind of claw-type rotor profile of full engagement |
CN108050061B (en) * | 2018-01-09 | 2023-08-29 | 中国石油大学(华东) | High-efficiency claw type rotor |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2058817A (en) * | 1931-12-22 | 1936-10-27 | Northey Rotary Engines Ltd | Rotary internal combustion engine |
US2097037A (en) * | 1933-08-25 | 1937-10-26 | Northey Rotary Engines Ltd | Rotary compressor or vacuum pump |
US2289371A (en) * | 1938-03-01 | 1942-07-14 | Jarvis C Marble | Rotary screw apparatus |
US3472445A (en) | 1968-04-08 | 1969-10-14 | Arthur E Brown | Rotary positive displacement machines |
SE351012B (en) * | 1970-10-01 | 1972-11-13 | Atlas Copco Ab | |
GB1335045A (en) * | 1970-10-17 | 1973-10-24 | Brown A E | Rotary displacement machines |
US4504201A (en) * | 1982-11-22 | 1985-03-12 | The Boc Group Plc | Mechanical pumps |
-
1988
- 1988-10-28 GB GB888825284A patent/GB8825284D0/en active Pending
-
1989
- 1989-10-18 DE DE89310702T patent/DE68907465T2/en not_active Expired - Fee Related
- 1989-10-18 EP EP89310702A patent/EP0366347B1/en not_active Expired - Lifetime
- 1989-10-18 ES ES198989310702T patent/ES2042004T3/en not_active Expired - Lifetime
- 1989-10-23 US US07/425,650 patent/US5055017A/en not_active Expired - Lifetime
- 1989-10-26 JP JP1279602A patent/JP3029202B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JP3029202B2 (en) | 2000-04-04 |
US5055017A (en) | 1991-10-08 |
GB8825284D0 (en) | 1988-11-30 |
JPH02185683A (en) | 1990-07-20 |
DE68907465T2 (en) | 1993-10-21 |
EP0366347A2 (en) | 1990-05-02 |
DE68907465D1 (en) | 1993-08-12 |
ES2042004T3 (en) | 1993-12-01 |
EP0366347A3 (en) | 1990-08-16 |
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